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Northwest Africa 12415
Basic information Name: Northwest Africa 12415
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12415
Observed fall: No
Year found: 2014
Country: Morocco
Mass:help 632 g
Classification
  history:
Recommended:  Eucrite-melt breccia    [explanation]

This is 1 of 24 approved meteorites classified as Eucrite-melt breccia.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 9 Feb 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12415 (NWA 12415)

Morocco

Purchased: 2014

Classification: HED achondrite (Eucrite, melt breccia)

History: Purchased by Larry Atkins from Morocco in October 2014.

Physical characteristics: Single stone, no fusion crust; exterior shows numerous light-brown clasts set in a dark matrix of shock melt.

Petrography: (C. Agee, UNM) (C. Agee, UNM) Microprobe examination shows basaltic clasts with approximately 60% pyroxene and 35% plagioclase grains most in the range 200-400 μm.

Geochemistry: (C. Agee, UNM) Low-Ca pyroxene Fs60.8±1.4Wo3.0±1.3, Fe/Mn=31±1, n=7; high-Ca pyroxene Fs27.4±1.0Wo42.5±1.2, Fe/Mn=32±2, n=5; plagioclase An89.4±0.3, n=5.

Classification: Eucrite-melt breccia, eucrite clasts are consistent with type 6 (Takeda and Graham, 1991) showing clear compositional separation of low and high calcium pyroxenes.

Specimens: 22 g including a probe mount on deposit at UNM, Larry Atkins holds the main mass.

Bibliography:
  • H. Takeda and A.L. Graham (1991) Degree of equilibration of eucritic pyroxenes and thermal metamorphism of the earliest planetary crust. Meteoritics 26 129-134. (link)
Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2014
Mass (g):632
Pieces:1
Class:Eucrite-melt breccia
Shock stage:High
Weathering grade:Moderate
Ferrosilite (mol%):60.8±1.4, 27.4±1.0
Wollastonite (mol%):3.0±1.3, 42.5±1.2
Classifier:C. Agee, UNM
Type spec mass (g):22
Type spec location:UNM
Main mass:Larry Atkins
Comments:Submitted by C. Agee
Institutions
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
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Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1386 approved meteorites from Morocco (plus 16 unapproved names) (plus 1 impact crater)

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